Advanced CMOS Biochips

Table of Contents

1. Frontmatter

2. Chapter 1. Introduction to CMOS Sensors

   Ebrahim Ghafar-Zadeh, Saghi Forouhi, Tayebeh Azadmousavi

   Abstract

   CMOS (Complementary Metal-Oxide-Semiconductor) technology is at the forefront of sensor integration, enabling the development of a diverse array of sensors on a single chip. These sensors include capacitive [1–5], impedimetric [6] optical [7], nuclear magnetic resonance (NMR) [8], magnetic hall effect [9], thermal [10], and mechanical [11] types, each designed to detect specific physical changes. CMOS technology facilitates the miniaturization and integration of these sensors, along with their interface circuits, onto a compact and cost-effective platform. This integration allows for the detection of minute electrical changes, which are then processed through on-chip analog circuits, converting analog signals into digital data that is transferred to an external data acquisition (DAQ) system, as illustrated in Fig. 1.1.

3. Chapter 2. CMOS Sensors’ Design Strategies

   Ebrahim Ghafar-Zadeh, Saghi Forouhi, Tayebeh Azadmousavi

   Abstract

   In designing a CMOS sensor, several critical factors must be carefully considered, including the application, sensing mechanism, CMOS chip design, electrical and chemical characterization procedures, and final test procedures. Each of these elements must be meticulously planned and integrated with practical considerations.

4. Chapter 3. Sensing Elements

   Ebrahim Ghafar-Zadeh, Saghi Forouhi, Tayebeh Azadmousavi

   Abstract

   This chapter provides an overview of the sensing mechanisms and transducers utilized in various types of CMOS biosensors, which are critical for detecting and measuring biological signals and chemical reactions. It offers a comprehensive exploration of various sensing mechanisms central to CMOS microelectrode systems and related technologies, including voltammetric, impedimetric, capacitive, optical, magnetic, and temperature sensors. The chapter details the electrode-electrolyte system, CMOS microelectrode structures, and fabrication, and explores microelectrode arrays (MEAs) for neural applications. It also examines Biological/Chemical Field-Effect Transistors (Bio/ChemFETs), their physics, operational regions, and fabrication, followed by a discussion on optical and magnetic sensing mechanisms. Additionally, it covers Nuclear Magnetic Resonance (NMR) principles and various temperature sensing methods, providing a deep understanding of their roles in different sensing environments.

5. Chapter 4. Interface Circuits

   Ebrahim Ghafar-Zadeh, Saghi Forouhi, Tayebeh Azadmousavi

   Abstract

   This chapter provides an in-depth exploration of the interface circuits designed for a variety of CMOS biosensors including voltammetric, impedimetric, capacitive, field-effect transistor (FET)-based, optical, magnetic, nuclear magnetic resonance (NMR), and temperature sensors as well as neural stimulation/recording systems. Each section of the chapter is designed to provide a comprehensive understanding of the circuits that drive these various CMOS biosensors, illustrating their significance in modern biochemical technologies.

6. Chapter 5. Advances in Electronic Biosensors

   Ebrahim Ghafar-Zadeh, Saghi Forouhi, Tayebeh Azadmousavi

   Abstract

   In recent years, the integration of complementary metal-oxide-semiconductor (CMOS) technology into various forms of biosensors and flexible electronics has revolutionized the landscape of healthcare, environmental monitoring, and robotics. This chapter delves into the multifaceted applications of these advanced devices, ranging from portable handheld biosensors and implantable monitoring systems to wearable electrochemical sensors and smart textiles. It also explores the innovative concept of “Body Dust”, which aims to push the boundaries of in-body diagnostics through the development of ultra-miniaturized sensors. Table 5.1 compares a few recent advances in this field. This chapter provides an overview of how CMOS technology is poised to transform real-time monitoring, data analysis, and personalized medicine.

7. Chapter 6. State-of -Art CMOS Biochip Technologies and Future Opportunities

   Ebrahim Ghafar-Zadeh, Saghi Forouhi, Tayebeh Azadmousavi

   Abstract

   This chapter provides an overview of recent advancements in CMOS sensing chips, highlighting their commercialization for various applications. The discussions emphasize the ongoing progress in CMOS sensor technology and its increasing relevance in life sciences, setting the stage for future innovations and applications. Related discussions are detailed in Sect. 6.2 of this chapter.

8. Backmatter